Javi started an IMP develop FAQ in github imp wiki:

<http://www.github.com/salilab/imp/wiki>

You are encouraged to add questions and answers (or propose questions if you don't know the answer).

As a note, one of the things that makes the github wiki quite tolerable compared to most wikis is that in addition to a nice, but fairly standard web interface, the whole wiki is a git repo. As a result, you can clone it and use any editor you want to work on the files offline and then commit and push the changes when you are done.